data_1011057
_publ_section_title              'The structure of diopside, Ca Mg (Si O3)2.'
_journal_coden_ASTM              ZEKGAX
_journal_name_full
;
Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik,
Kristallchemie (-144,1977)
;
_journal_page_first              168
_journal_page_last               193
_journal_volume                  69
_journal_year                    1928
_chemical_formula_structural     'Ca Mg (Si O3)2'
_chemical_formula_sum            'Ca Mg O6 Si2'
_chemical_name_mineral           Diopside
_chemical_name_systematic        'Calcium magnesium catena-silicate'
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      15
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 74.16
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.71
_cell_length_b                   8.89
_cell_length_c                   5.24
_cell_volume                     435.2
_cod_database_code               1011057
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x,y,1/2-z
-x,-y,-z
x,-y,1/2+z
1/2+x,1/2+y,z
1/2-x,1/2+y,1/2-z
1/2-x,1/2-y,-z
1/2+x,1/2-y,1/2+z
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_calc_flag
Ca1 Ca2+ 4 e 0. -0.306 0.25 1. 0 d
Mg1 Mg2+ 4 e 0. 0.083 0.25 1. 0 d
Si1 Si4+ 8 f 0.211 0.412 0.237 1. 0 d
O1 O2- 8 f 0.378 0.403 0.139 1. 0 d
O2 O2- 8 f 0.142 0.25 0.32 1. 0 d
O3 O2- 8 f 0.156 0.48 0. 1. 0 d
loop_
_atom_type_symbol
_atom_type_oxidation_number
Ca2+ 2.000
Mg2+ 2.000
Si4+ 4.000
O2- -2.000
